Solutions by everydaycalculation.com
1530 - 530 is 13.
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Related: 15/30-10/30 15/60-5/30 15/30-5/60 45/30-5/30 15/30-15/30 15/90-5/30 15/30-5/90 75/30-5/30 15/30-25/30 15/30-35/30
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